Group : Rocket Engines
Status : Under Development
Also Known As : BE-4U
Origin : United States of America
Contractor : Blue Origin
Initial Operational Capability (IOC) : 2020
First Flight : 2019
Total Production : ?

The BE-4 is a fourth generation rocket engine developed by Blue Origin as the replacement for the Russian made RD-180 engine. The engine burns a combination of Liquid Oxygen (LOx) and Liquefied Natural Gas (LNG) to achieve a maximum thrust of 550,000 pounds. The BE-4 engine has been selected to power the first stage of the New Glenn rocket with seven engines assigned to this task. The BE-4 engine is expected to fly with the United Launch Alliance (ULA) Vulcan Centaur space launch system in 2019 powering the first stage.

The BE-4U is a further variant of the BE-4 featuring a larger nozzle to effectively operate in the vacuum of orbital space. The BE-4U engine has been selected to power the second stage of the New Glenn space launch system also developed by Blue Origin.